ArntyR

That's welcome info technozen and it gives me hope to keep trying despite no mention of EKA in the SAIC owner guide.

But nobody else has reported that they've got it to work for them. I'd have thought someone (else) would respond. 'markvrs' has been a like-minded contributor and he can't get EKA working on his SAIC, either. He originally drew my attention to the lack of mention of EKA in the SAIC owner manual and suggested that denaturing it might be a consequence of further security update to Thatcham1, along with the separate battery-powered, isolated, alarm/screech function.

And thanks for your input pscan. I can't see a direct link with my results yet but if I try to replicate your process and get the same results, again, it'll keep me motivated to keep chipping away at the problem. (I haven't done a log file yet so this'll be a new experience...) If you wouldn't mind duplicating my process, too, it'd give me something to compare with and if your results are the same as mine - but your EKA works - it'll prove that I'm barking up the wrong tree.

I'm still suspicious about why my own doorlock investigation seemed to show that there seemed to be a constant a 'controlling default'...